Packing box for trash bag



FIG. 1 is an exploded front perspective view of a packing box for trash bag showing my new design;

FIG. 2 is an exploded right side view thereof;

FIG. 3 is an exploded left side view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines shown in the figures represent portions of the packing box for trash bag that form no part of the claimed design. 

CLAIM The ornamental design for a packing box for trash bag, as shown and described. 